Why does Rank tracker say i rank higher than i do?

when i check my rankings using rank tracker with some results i rank high but when i manually check them i am not that high? iv deleted all history,cookies etc anything that will influence what google will display to me.

Google uses different data centers. Rank trackers can sometimes pull your rank from a data center that you might have never accessed from your PC. In some cases, it can take a few days for all the data centers to show the right rank. In some cases, they will actually never synchronize, especially if your site is always dancing a little bit.

I show different rankings on different ones as well.
It's a bit of a pain. I use SEScout.
I have my two main keywords for one site with 14k exacts.
SEScout has them as #10 and #27, but if you use zend2.com (US proxy), I show up as #2 on both of them. And it's been like that for months, for some reason.

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